Migrate compiler, idea and others to new case conversion api

plugins/kapt3/kapt3-base/src/org/jetbrains/kotlin/kapt3/base/incremental/incrementalProcessorDiscovery.kt

@@ -53,7 +53,7 @@ private fun processSingleClasspathEntry(rootFile: File): Map<String, DeclaredPro
     for (line in text) {
         val parts = line.split(",")
         if (parts.size == 2) {
-            val kind = parts[1].toUpperCase(Locale.ENGLISH)
+            val kind = parts[1].uppercase()
             if (INCREMENTAL_DECLARED_TYPES.contains(kind)) {
                 nameToType[parts[0]] = enumValueOf(kind)
             }

plugins/kapt3/kapt3-base/src/org/jetbrains/kotlin/kapt3/base/incremental/incrementalProcessors.kt

@@ -50,7 +50,7 @@ class IncrementalProcessor(private val processor: Processor, private val kind: D
             if (fromOptions == null) {
                 RuntimeProcType.NON_INCREMENTAL
             } else {
-                val declaredType = fromOptions.drop("org.gradle.annotation.processing.".length).toUpperCase(Locale.US)
+                val declaredType = fromOptions.drop("org.gradle.annotation.processing.".length).uppercase()
                 if (ALLOWED_RUNTIME_TYPES.contains(declaredType)) {
                     enumValueOf(declaredType)
                 } else {

plugins/kapt3/kapt3-base/test/JavaKaptContextTest.kt

@@ -36,7 +36,8 @@ class JavaKaptContextTest : TestCase() {
                         val annotatedElements = roundEnv.getElementsAnnotatedWith(annotation)
 
                         for (annotatedElement in annotatedElements) {
-                            val generatedClassName = annotatedElement.simpleName.toString().capitalize() + annotationName.capitalize()
+                            val generatedClassName = annotatedElement.simpleName.toString().replaceFirstChar(Char::uppercaseChar) +
+                                    annotationName.replaceFirstChar(Char::uppercaseChar)
                             val file = processingEnv.filer.createSourceFile("generated." + generatedClassName)
                             file.openWriter().use {
                                 it.write(

plugins/kapt3/kapt3-base/test/KaptPathsTest.kt

@@ -15,7 +15,7 @@ import java.nio.file.Files
 class KaptPathsTest : TestCase() {
     @Test
     fun testSymbolicLinks() {
-        if (System.getProperty("os.name").toLowerCase().contains("win")) return
+        if (System.getProperty("os.name").lowercase().contains("win")) return
         val tempDir = Files.createTempDirectory("kapt-test").toFile()
         try {
             fun File.writeJavaClass() = apply {

plugins/kapt3/kapt3-cli/src/KaptCli.kt

@@ -170,7 +170,7 @@ private fun argError(text: String): Nothing {
 
 private fun findKaptCompilerPlugin(): File? {
     val pathToThisJar = File(PathUtil.getJarPathForClass(CliToolOption::class.java))
-    if (pathToThisJar.extension.toLowerCase() != "jar") {
+    if (pathToThisJar.extension.lowercase() != "jar") {
         return null
     }
 

plugins/kapt3/kapt3-compiler/test/org/jetbrains/kotlin/kapt3/test/AbstractKotlinKapt3Test.kt

@@ -161,7 +161,7 @@ abstract class AbstractKotlinKapt3Test : KotlinKapt3TestBase() {
             )
 
             val javaFiles = files
-                .filter { it.name.toLowerCase().endsWith(".java") }
+                .filter { it.name.lowercase().endsWith(".java") }
                 .map { createTempFile(it.name.substringBeforeLast('.'), ".java", it.content) }
 
             check(kaptContext, javaFiles, txtFile, wholeFile)
@@ -294,7 +294,7 @@ open class AbstractClassFileToSourceStubConverterTest : AbstractKotlinKapt3Test(
                 .map {
                     // Unfortunately, we can't use the file name as it can contain temporary prefix
                     val name = it.source?.name?.substringAfterLast("/") ?: ""
-                    val kind = when (name.substringAfterLast(".").toLowerCase()) {
+                    val kind = when (name.substringAfterLast(".").lowercase()) {
                         "kt" -> "kotlin"
                         "java" -> "java"
                         else -> "other"

plugins/kapt3/kapt3-compiler/test/org/jetbrains/kotlin/kapt3/test/java9TestUtils.kt

@@ -48,7 +48,7 @@ interface CustomJdkTestLauncher {
         val currentJavaHome = System.getProperty("java.home")
 
         val classpath = collectClasspath(AbstractClassFileToSourceStubConverterTest::class.java.classLoader)
-            .filter { it.protocol.toLowerCase() == "file" && it.path != null && !it.path.startsWith(currentJavaHome) }
+            .filter { it.protocol.lowercase() == "file" && it.path != null && !it.path.startsWith(currentJavaHome) }
             .map { it.path }
 
         val command = arrayOf(

plugins/kapt3/kapt3-idea/src/org/jetbrains/kotlin/kapt/idea/KaptGradleProjectImportHandler.kt

@@ -43,7 +43,7 @@ class KaptGradleProjectImportHandler : GradleProjectImportHandler {
 
     private fun isKaptCompilerPluginPath(path: String): Boolean {
         val lastIndexOfFile = path.lastIndexOfAny(charArrayOf('/', File.separatorChar)).takeIf { it >= 0 } ?: return false
-        val fileName = path.drop(lastIndexOfFile + 1).toLowerCase(Locale.US)
+        val fileName = path.drop(lastIndexOfFile + 1).lowercase()
         return fileName.matches("kotlin\\-annotation\\-processing(\\-gradle)?\\-[0-9].*\\.jar".toRegex())
     }
 }